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400 BCE
Democritus
First to suggest Atoms were tiny indestructible beings -
Period: 400 BCE to
History of Atoms
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John Dalton
All matter is made of atoms that are invisible and indestructible -
Dmitri mendeleev
First to use trends in the periodic table to predict properties of missing elements. -
Eugene Goldstein
Discovered protons by using cathode rays and attracting them to a positive charge -
J.J. Thomson
used a crookes tube to demonstrate cathode rays are negatively charged. -
Max planck
originated the quantum theory -
Robert Millikan
oil drop experiment helped quantify the charge of an electron -
Nielso Bohr
THeory that energy is only transferred in well defined quantities -
Erwin Schrodinger
Used mathematical equations to describe the likelihood of finding an atom in a certain position -
James chadwick
used beryllium with alpha particles causing radiation and discovering neutrons. -
werner Heisenberg
Found the uncertainty principle and quantum mechanics -
Ernest Rutherford
used the gold foil experiment to show the nucleus is tiny and heavy